As an accurate reading of the original post indicates, nowhere does it say that someone is planning to do this, is doing this or has done this.
The question is an obvious one born out of curiousity arising from reading posts in which someone is in a circumstance which will require him to exceed the mileage recommendation, and he asks for advice regarding whether to go to the next phase early because he's almost reached the suggested mileage, exceed the recommendation because he'll go over by just a relatively few miles or make some special adjustment to the usual regimen because he'll be well past the numbers in the instructions.
Many times the "change the filter and top off the oil level" answer has been given, but I've never seen any discussion regarding what will happen - good or bad - if the miles just keep accumulating.
The concerns mentioned by Rich21 are shared by me, and I certainly advocate following the directions. I'm just curious about what could or would happen under certain mileage-exceeding scenarios, whether they be in the clean and/or rinse phases. Surely this subject has come up sometime before, be it during product testing which ultimately resulted in the mileage recommendations, or during customer usage which, if negative, most likely made itself known via a complaint back to the company or to a forum such as this one.
So, after all of that, we're still left with the original question. What happens?